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Definitely do... What you're talking about adding is called the big 3 upgrade in audio terms...
Battery to alternator positive
Battery to chassis ground
Battery to engine block ground
You're adding an extra length of positive to keep the battery well charged and 2 extra lengths of grounding to make sure everything doesn't short out...
It's highly recommended to put an inline fuse between the battery and alternator length just for safety measures as well... If you're still questioning anything, there's a ton on YouTube how to's lol
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Misty: 3400, S&S headers, TCE 65mm TB, CAI, 180* TStat, Milzy motor & tranny mount, 18" BOSS 328 & much more... going osv!!
Silver: 2.4L, 5 speed, GAGT seats, front & rear STB's, all red tails, led headlights, Magnaflow muffler, Milzy Motor mount, WAI, Cosmo short shifter; sold n missed  
Tequila: 2.4L, GA interior swap, scrapped...
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